/* Programmer's Notebook Theme */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Fira+Code:wght@400;500;600&display=swap');

:root {
  --transition-speed: 0.25s;
  --border-radius: 6px;
  /* Sharper borders for a technical look */

  /* Topic Colors */
  --topic-arrays: #3B82F6;
  --topic-linked-lists: #10B981;
  --topic-graphs: #8B5CF6;
  --topic-dp: #F5990B;
}

/* Smooth Scroll */
html {
  scroll-behavior: smooth;
}

/* Hide chapter numbers in sidebar and main content if needed */
.sidebar-navigation .chapter-number,
.quarto-title-block .chapter-number {
  display: none !important;
}

/* Hide Default Quarto Metadata */
.quarto-title-meta {
  display: none !important;
}

/* Light Mode Variables */
body.quarto-light {
  --primary-color: #4F46E5;
  --secondary-color: #1E293B;
  --bg-color: #F8FAFC;
  --surface-color: #FFFFFF;
  --accent-color: #06B6D4;
  --text-color: #334155;
  --heading-color: #0F172A;
  --card-bg: #FFFFFF;
  --card-border: #E2E8F0;
  --grid-color: rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

/* Dark Mode Variables */
body.quarto-dark {
  --primary-color: #818CF8;
  --secondary-color: #F8FAFC;
  --bg-color: #0F172A;
  --surface-color: #1E293B;
  --accent-color: #22D3EE;
  --text-color: #E2E8F0;
  --heading-color: #F8FAFC;
  --card-bg: #1E293B;
  --card-border: #334155;
  --grid-color: rgba(255, 255, 255, 0.03);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  /* Dot Grid Background */
  background-image: radial-gradient(var(--grid-color) 1px, transparent 1px);
  background-size: 24px 24px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--heading-color);
}

/* Monospace for technical labels */
.card-title,
.navbar-brand,
.sidebar-title,
.callout-header,
.footer-metadata {
  font-family: 'Fira Code', monospace !important;
  font-weight: 600;
}

code,
pre,
.code-block {
  font-family: 'Fira Code', monospace;
}

/* Hero Section - Notebook Entry Style with Blended Image */
.hero-section {
  background: linear-gradient(135deg, var(--surface-color) 0%, rgba(255, 255, 255, 0.8) 100%), url('hero.png');
  background-size: cover;
  background-position: center;
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 5rem 2rem;
  margin-bottom: 4rem;
  text-align: left;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

body.quarto-dark .hero-section {
  background: linear-gradient(135deg, var(--surface-color) 0%, rgba(15, 23, 42, 0.8) 100%), url('hero.png');
  background-size: cover;
  background-position: center;
}

.hero-section::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(var(--grid-color) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  opacity: 0.5;
}

.hero-section::before {
  content: "ENTRY_01";
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  opacity: 0.6;
  letter-spacing: 0.1em;
  z-index: 2;
}

.hero-section h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--heading-color);
  margin-bottom: 1rem;
  border-left: 8px solid var(--primary-color);
  padding-left: 1.5rem;
  position: relative;
  z-index: 2;
  text-shadow: 0 2px 10px rgba(255, 255, 255, 0.5);
}

body.quarto-dark .hero-section h1 {
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-section .lead {
  font-size: 1.35rem;
  color: var(--text-color);
  max-width: 650px;
  margin-left: 2rem;
  margin-bottom: 2.5rem;
  font-weight: 500;
  position: relative;
  z-index: 2;
}

.btn-hero {
  background-color: var(--primary-color);
  color: white;
  padding: 0.6rem 1.5rem;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid var(--primary-color);
  text-decoration: none;
  display: inline-block;
  margin-left: 2rem;
}

.btn-hero:hover {
  background-color: transparent;
  color: var(--primary-color);
}

/* Notebook "Cell" Cards */
.glass-card {
  background: var(--surface-color);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 0;
  /* Header will have padding */
  height: 100%;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.glass-card::before {
  content: "";
  height: 24px;
  background: var(--bg-color);
  border-bottom: 1px solid var(--card-border);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  display: flex;
  align-items: center;
  padding: 0 10px;
  background-image: radial-gradient(circle, var(--card-border) 3px, transparent 3px);
  background-size: 12px 100%;
  background-repeat: no-repeat;
  background-position: 10px center;
}

.glass-card-content {
  padding: 1.5rem;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.glass-card h5 {
  color: var(--heading-color);
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.glass-card p {
  color: var(--text-color);
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 0;
}

/* Navbar - IDE Toolbar Style */
.navbar {
  background: var(--surface-color) !important;
  border-bottom: 1px solid var(--card-border);
  padding: 0.5rem 1rem;
}

.navbar-brand {
  font-size: 1.1rem;
  color: var(--primary-color) !important;
}

.navbar-brand::before {
  content: "> ";
  opacity: 0.6;
}

.navbar-nav .nav-link {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  padding: 0.4rem 0.8rem !important;
  border-radius: 4px;
}

.navbar-nav .nav-link:hover {
  background: var(--bg-color);
}

/* Sidebar - File Explorer Style */
#quarto-sidebar {
  background: var(--bg-color);
  border-right: 1px solid var(--card-border);
}

.sidebar-item-container .active {
  background: var(--surface-color) !important;
  border-left: none !important;
  color: var(--primary-color) !important;
  font-weight: 600;
  box-shadow: inset 4px 0 0 var(--primary-color);
}

.sidebar-link {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  padding: 0.4rem 1rem !important;
}

/* Callouts - Terminal/Note Style */
.callout {
  background: var(--surface-color);
  border: 1px solid var(--card-border) !important;
  border-radius: var(--border-radius);
  box-shadow: none;
}

.callout-header {
  background: var(--bg-color);
  border-bottom: 1px solid var(--card-border);
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Code Blocks - IDE Window Style */
div.sourceCode {
  background-color: #1E1E1E;
  /* Dark code block even in light mode for contrast */
  border: 1px solid #333;
  border-radius: var(--border-radius);
  padding: 0;
  margin: 2rem 0;
  overflow: hidden;
}

div.sourceCode::before {
  content: "● ● ●";
  display: block;
  background: #2D2D2D;
  color: #555;
  padding: 6px 15px;
  font-size: 10px;
  letter-spacing: 2px;
  border-bottom: 1px solid #333;
}

div.sourceCode pre {
  padding: 1.25rem;
  margin: 0;
  color: #D4D4D4;
}

/* Footer Metadata */
.footer-metadata {
  background: var(--surface-color);
  border: 1px solid var(--card-border);
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: left;
  display: inline-block;
  min-width: 300px;
}

.footer-metadata p::before {
  color: var(--primary-color);
  opacity: 0.6;
}

/* Topic Accents - Left Border instead of Top */
.topic-arrays {
  border-left: 4px solid var(--topic-arrays);
}

.topic-linked-lists {
  border-left: 4px solid var(--topic-linked-lists);
}

.topic-graphs {
  border-left: 4px solid var(--topic-graphs);
}

.topic-dp {
  border-left: 4px solid var(--topic-dp);
}

/* Animations */
.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}